Australia denies its multi-billion-dollar spending boost for WA shipyards is about appeasing the Trump administration, as defence analysts warn billions more will be needed.

The Albanese government unveiled $12 billion for the Henderson Defence Precinct in Perth, where the nuclear submarines Australia has been promised under the AUKUS security pact will be able to dock.

Uncertainty clouds the nuclear submarine deal, which is being reviewed by the US.

However, US media reports Secretary of State Marco Rubio has provided assurances the deal will proceed.

The Trump administration is pressuring Australia to increase its defence spending to 3.5 per cent of gross domestic product.

Under the $386 billion agreement, Australia will acquire at least three nuclear-powered Virginia-class submarin

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